UCN production in superfluid heliumW. Schott1, J.M. Pendlebury2, I. Altarev1, S. Gröger1, E. Gutsmiedl1, F.J. Hartmann1, S. Paul1, G. Petzoldt1, P. Schmidt-Wellenburg1 and U. Trinks1
1 Physik-Department E18, TU- München, D-85747 Garching, Germany
2 School of Chemistry, Physics and Environmental Science, University of Sussex, Brighton, Sussex, BNI 9QJ, UK
(Received: 28 March 2002 / Revised version: 11 November 2002 / Published online: 11 March 2003)
Ultra-cold neutrons (UCN) are produced in superfluid helium by single- and multi-phonon excitation. The UCN production rate density via multiphonons can be larger than that by one-phonon excitation being due to the dependence of the incident neutron spectral flux density on the wavelength .
78.70.Nx - Neutron inelastic scattering.
67.20.+k - Quantum effects on the structure and dynamics of nondegenerate fluids (e.g., normal phase liquid ).
61.12.Ex - Neutron scattering techniques (including small-angle scattering).
29.25.Dz - Neutron sources.
© Società Italiana di Fisica, Springer-Verlag 2003